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Conference on Lasers and Electro-Optics

Picosecond four-wave mixing in a saturable amplifier polymer dye

T. Yonekawa, Takashige Omatsu, T. Hirose, Yoichiro Ueda, Mitsuhiro Tateda

Published Jan 1, 2001• 0 citations
Publisher

Abstract

Summary form only given. Self-diffraction by four-wave-mixing (FWM) in a nonlinear medium such as liquid crystals and photorefractive materials can contribute to perform energy transfer between the two incident beams. FWM in a saturable gain media has received an intense attention in recent years. Owing to the amplification experienced by all the interaction beams, the high diffraction efficiency is expected. This paper presents the demonstration of transient self-diffraction by pico-second FWM in a saturable amplifier Rhodamine 6G polymer dye. In this work, we extend our previous study of FWM in an inverted polymer dye in the transient regime by using signal and pump lasers with pulse duration of much less than the population relaxation time (several nanoseconds) in the polymer dye. The polymer dye saturable amplifier is shown to be an excellent nonlinear material with high diffraction efficiency and fast response time. It has a potential for applications such as real-time holography, phase conjugation, pulse shaping, and all optical temporal-spatial conversion.

DOI
10.1109/cleo.2001.947967

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Summary form only given. Self-diffraction by four-wave-mixing (FWM) in a nonlinear medium such as liquid crystals and photorefractive materials can contribute to perform energy transfer between the two incident beams. FWM in a saturable gain media has received an intense attention in recent years. Owing to the amplification experienced by all the interaction beams, the high diffraction efficiency is expected. This paper presents the demonstration of transient self-diffraction by pico-second FWM in a saturable amplifier Rhodamine 6G polymer dye. In this work, we extend our previous study of FWM in an inverted polymer dye in the transient regime by using signal and pump lasers with pulse duration of much less than the population relaxation time (several nanoseconds) in the polymer dye. The polymer dye saturable amplifier is shown to be an excellent nonlinear material with high diffraction efficiency and fast response time. It has a potential for applications such as real-time holography, phase conjugation, pulse shaping, and all optical temporal-spatial conversion.
Phase conjugal ion by degenerate four-wave mixing (DTVVM) in saturable gain media is a nonlinear process of major interest for applications to dynamic holography and phase-distortion correction of an optical wave propagating in laser media [1,2,3]. The use of laser amplifiers for such operations presents very attractive features including the automatic matching of the nonlinearity with the laser wavelength, a fast response time and a high efficiency of the nonlinear process due to the laser amplification of all interacting beams. This process is based on the possibility of writing dynamic gain gratings when interfering beams are propagating in a laser medium by gain saturation.
Degenerate four-wave mixing with orthogonally polarized pump beams at /spl lambda/=1.06 /spl mu/m in the saturable gain of a flash-lamp-pumped Nd:YAG amplifier is investigated, both experimentally and theoretically, using pulses of duration much less than the population relaxation time. We introduce a new set of coupled-wave equations in this short pulse regime that includes the effect of the four interacting waves and the laser gain experienced by all the beams. The dependence of the efficiency of the process on the small-intensity-gain-length product, beam ratios, and fluences is analyzed. A reflectivity of a weak probe beam of 25 percent and a transmission-gain-grating diffraction efficiency of 32 percent are achieved. Finally, the temporal shape of the conjugate signal is studied for various gain-saturation regimes.>